Control valve



FIG. 1 is a front perspective view of a control valve showing my new design;

FIG. 2 is a top left perspective view thereof; and,

FIG. 3 is a bottom right perspective view thereof.

The broken lines shown in the figures are included for the purpose of illustrating portions of the control valve and form no part of the claimed design. 

CLAIM The ornamental design for a control valve, as shown and described. 